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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Collections;

namespace _1207_数组删除元素

{

    class Program

    {       

        //只能在动态数组ArrayList类中对数组执行删除元素的操作。

        //因为动态数组是一个可以改变数组长度和元素个数的数据类型。

        //为Program类定义一个静态方法Show

        public static void Show(ArrayList alist)

        {

            for (int i = 0; i < alist.Count; i++)

            {

                Console.Write("[{0}]:{1} ", i, alist[i]);

            }

            Console.WriteLine("\n");

        }

        static void Main(string[] args)

        {

            // C#数组删除元素

            ArrayList arraylist = new ArrayList();

            for (int i = 0; i < 7; i++)

            {

                arraylist.Add(i);

            }

            Console.WriteLine("1. 数组列表的容量为{0}，实际包含{1}个元素：",

                arraylist.Capacity, arraylist.Count);

            Show(arraylist);

            arraylist.Remove(3);   // 删除数组元素

            arraylist.RemoveAt(5); // 删除指定索引位置5的元素

            Console.WriteLine("2. 数组列表的容量为{0}，实际包含{1}个元素：",

                arraylist.Capacity, arraylist.Count);

            Show(arraylist);

            Console.ReadLine();

        }

    }

}

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List<int> aa =new List<int> {1,2,3,4,5 };

   List<int> bb = new List<int> { 1,2,3 };

   aa.RemoveAll(p=>bb.Contains(p));